US2215545A - Method and machine for wrapping packages - Google Patents

Description

Sept. 24, 1940. R. c. DEML ER METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 16 sheets -sheet l s m 9 a1 0 3. mm M m g a v n m n f a w n m w p 1940- 'R. c. DEMLER 2,215,545

METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14. 1938 16 Sheets-Sheet s N Z I N N Q a Q I a a 2Q R. c. DEMLER METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 16 Shets-Sheet 4 Sept. 24, 1940. R. c. DEMLER METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 16 Sheets-Sheet 5 w I'lllllllfllIIIIIIIlIlI/I I Sept. 24, 1940.

R. c. DEMLER METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1958 16 Sheets-Sheet 7 35 INW 4 Illlllllll Ill R. c. \DEMLER 2,215,545

METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 16 Sheets-Sheet 8 p 24,1940. R. c. DEMLER 2,215,545

METHOD AND MACHINE FOR WRAPPING PACKAGES Sept. 24, 1940. R. c. DEMLER METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 16 Sheets-Sheet 1O NNm mww Sept. 24, 1940. R. c. DEMLER METHOD AND MACHINE FOR WRAPPING PACKAGES l6 Sheets-Sheet l 1' Filed May 14, 1958 I III III- PP 1940- R. c. DEMLER 2,215,545

METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 l6 Sheets-Sheet l2 Sept. 24, 1940. R. c. DEMLER.

METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 l6 Sheets-Sheet 15v FItIL QBN q@r@l NMN NwH Sept. 24, 1940. R. c. DEMLER 5 METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 16 Sheets-Sheet -14 R. C. DEMLER Sept. 24, 1940.

METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 16 Sheets-Sheet l5 16 SheetsSheet l6 hmN MN R. C. DEMLER METHOD AND MACHINE FOR WRAPPING PACKAGES Filed May 14, 1938 a a W MEN lw- WNN Sept. 24, 1940.

Patented Sept. 24, 1940 JNITED STATE METHOD MACHINE FOR WRAPPING PACKAGES Ray C. Demler, Tacoma, Wash, assignor to Pacific Forest Industries, Tacoma, Wash, a corporation of Washington Application May 14, 1938, Serial No. 208,027

'Ihe present invention relates to a method and machine for wrapping or packaging various articles, and is particularly useful in wrapping plywood panels or the like.

The primary object of'the invention is the provision of a method and machine for wrapping or packagin plywood panels or sheets in sectional cartons, wherein each carton section is provided with side, end and corner flaps. The method contemplates assembling a stack of panels between a. pair of flat carton sections and then feeding the assembled stack, first in one direction while one set of flaps are folded, glued and pressed, and then feeding the partially wrapped package in a direction substantially transverse to its initial'direction of travel, while the corner and other set of flaps are folded, glued and pressed to form the completely wrapped package.

A further object is the provision of a machine in which the carton sections and panels may be assembled, and the assembled stack then fed automatically through the machine while the several sets of flaps are systematically folded,

glued and pressed to provide the completely wrapped package ready for immediate shipment.

Another object provides an assembly table upon which the carton sections and panels may be initially assembled, with the panels being so positioned with respect to the carton flaps that a the assembled stack may be fed to the other units of the machine without any further attention of the operators.

An additional object is the provision of means for applying pressure to the partially wrapped packages before the glue has set, to compress the package and flatten out and expel any air pockets from between the various sheets or panels of plywood.

A still further object is the provision of a package actuated transfer mechanism which will receive a partially wrapped package from one conveyor unit and automatically transfer it to a second conveyor unit extending in a direction substantially transverse to the first unit.

Another object is to provide means for controlling the feed of the packages through the machine to prevent crowding of and injury to the packages. Means are also associated with the transfer mechanism for rendering certain of the conveyor units inoperative when a package packages of various sizes. Furthermore, means are provided to adjust the package operated control means of the transfer mechanism to accormnodate packages of difierent lengths.

A further. object is the provision of a method 5 and machine for effectively and securely wrapping stack plywood panels without injuring the panels during the wrapp operation.

With the foregoing and other objects in view, the invention will now be more fully described, 10 reference being had to the accompanying drawings, wherein:

Figure 1 is a diagrammatic plan view of the complete wrapping machine;

Figure 2 is a side elevation of the machine 15.

shown in Figure l;

Figure 3 is an end elevation of the machine shown in Figure 1-; a

Figure 4 is a perspective view of a stack of sheets assembled between a pair of carton sec- 20 tions ready for the wrapping operation; Figure 5 is a perspective view of a partially wrapped package;

Figure 6 is a perspective view of a completely wrapped package;

Figure '7 is a detail .of the several switches, motors and the circuits connecting the same;

Figure 8 is a top plan view of the assembly table; 7

Figure 9 is an end elevation of the assembly table;

Figure 10 is a top plan view of a portion of the side flap folding and gluing section;

Figure 11 is a side elevation thereof;

Figure 12 is a section taken on line l2-l2 of Figure 10; Figure 13 is an enlarged elevation of the glue applicator as viewed from the inside of the machine;

Figure 14 is a section taken onjline M-IQ of Figure 11;

Figure 15 is a section taken on line 15-! 5 of Figure 11;

Figure 16 is a top plan view -ofone end porand the front portion of the tonpressure roll section;

V Figure l'l' is a side elevation thereof;

Figure 181s a section taken-on line l8l8 of Figure 17; r r 5 Figure. 19 is a section taken on line l;9l9

of Figure 17 Figure 20 is a top plan view of the top pressure roll section and the front portion of the side flap sealing section;

Figure 21 is a side elevation thereof;

Figure 22 is a section taken on line 2222 of Figure 21;

Figure 23 is a section taken on line 2323 of Figure 21;

Figure 24 is an enlarged detail of the mounting for one of the side flap sealing rollers;

Figure 25 is a top plan view of the transfer table and the corner fiap tucking mechanism;

Figure 26 is a side elevation of the transfer mechanism;

Figure 27 is an enlarged detail of a part of the transfer table;

Figure 28 is an enlarged detail of the package actuated control means for the transfer mechanism; 4

Figure 29 is an end elevation of the transfer mechanism partly in section; I

Figure 30 is a top plan view of the drive mechanism for the transfer table;

Figure 31 is a side elevation of the corner fiap tucking mechanism and the front portion of the end flap folding and gluing section;

Figure 32 is an enlarged detail of the switch for controlling the corner flap tucking mechanism; and

Figure 33 is a section taken on line 33--33 of Figure 32.

General description of method and machine Referring to Figures 1 to 6, there are disclosed diagrammatic views of the wrapping-ma chine and the package as it appears at various stages of its progress through the machine. While the machine may be used for wrapping numerous materials, it is primarily designed for wrapping plywood sheets or panels in sectional cartons. Furthermore, while various formsof sectional cartons may be employed, the one illustrated in Figure 4 is the preferred type. In this embodiment, each carton section comprises a fiat sheet-like element 20 of relatively heavy paper board or other similar material. This section consists of .a body portion 2|, opposed side flaps 22, opposed end flaps 23, and corner flaps 24 secured to and forming continuations of the side flaps 22. The corner flaps are separated from the end flaps by slots 25 which are of sufficient width to permit the several flaps to be readily folded during their progress through the machine without interference from the other flaps.

The machine (see Figures 1 and 2) is provided with an assembly section or table A where a plurality or stack of panels are assembled between a pair of carton sections. In assembling each stack prior to its travel through the machine, a carton section 20 is first placed upon the assembly table A with its flaps in relatively uncreased or unfolded condition and extending in substantially the same plane as the body of the section. A stack of plywood panels are then placed upon the section within the area covered by the body portion 2|, and a second carton section is then placed on top of the stack in the same relation as the lower section, that is, with the several flaps projecting beyond the confines of the stack (see Figure 4). It is to be understood that the machine is capable of receiving panels of various lengths, widths and thicknesses and that carton sections of various sizes may be provided to accommodate the type of panel to be wrapped.

After the carton sections and stack of panels have been assembled as indicated, the assembled stack is then moved forward into position to be received within a side flap gluing and folding section B joining the assembly table A. This section is preferably provided with upper and lower conveyor belts (to be later described in detail) which receive and feed the assembled stack while the side flaps 22 of the upper carton section are being folded down against the stack. The side flaps of the lower carton section are then passed under glue applicators which apply glue to the inner or upper surfaces of these flaps while in their unfolded condition. As the assembled stack is fed further through the section B, the lower glued side flaps are then folded upwardly against the folded side flaps of the top carton section and the folded flaps are thereafter maintained in contacting relation.

The partially wrapped package is then fed into a top pressure roll section C which applies pressure upon the top carton section before the glue has set. This is for the purpose of pressing or squeezing out any air pockets formed in the plywood panels and to compress the carton sections together. Thereafter, the package is fed into a relatively long side flap sealing section D provided with means for applying pressure to the folded and glued side flaps until the glue has set, thereby completely sealing the side flaps of both carton sections. As the partially wrapped package is fed to the end of section D, it will have assumed the appearance of the package shown in Figure 5 of the drawings. That is, the side flaps will have been folded, glued and sealed, but the end and corner flaps willstill be in unfolded condition.

The package is then moved onto a transfer section E which is provided with package operated means for first stopping the forward progress of the package and then moving the package laterally or in a direction transverse to its path of movement through the sections 13, C and D. As the partially wrapped package passes from the transfer section E, it is received by and fed through an end flap gluing and folding section F. However, during its movement from the section E to the section F, means are provided for tucking or folding in both sets of corner flaps 24. The end flaps 23 of the top carton section are then folded down upon the folded corner flaps and are retained in this position while the upper or inner surfaces of the end flaps 24 of the lower carton section are coated with glue or adhesive. Thereafter, these flaps are folded up against the folded end flaps of the upper carton section, in a manner similar to that described in connection with the folding and gluing of the side flaps. In like manner, the package is fed through a top pressure roll section G which again applies pressure to the top carton section to assure that the sections are tightly wrapped about the panels.

The package is finally passed through an end flap sealing section H which applies pressure to the folded end flaps and maintains the flaps in this condition until the glue has had an opportunity to set and thereby completely seal the end flaps. As the package passes out of the section H, the stack of panels will be completely wrapped as shown in Figure 6, and may be stacked or stored ready for shipment. If desired, means may be provided to wax the under surfaces of the packages as they leave the sealing section H. This is for the purpose of preventing the packages from scufiing when one package is moved over another in transit.

It is to be understood that as one assembled stack is fed from the assembly table A into the side flap gluing and folding section B, another stack may be immediately assembled and fed to the section B, and this operation con inued as desired. Means are provided, however (which will later be described), for controlling the passage of the partially wrapped packages through the machine to prevent crowding and possible injury to the packages. Furthermore, means are provided whereby when a package is in the transfer mechanism, the feeding means for the sections B, C and D are rendered inope ative until the package has been transferred 0 the end flap gluing and folding section F.

Assembly table The machine will now be described in detail. With respect to the assembly section or table A, this is clearly illustrated in Figures 8 and 9,

wherein the numeral 26 designates spaced con-- carried spaced longitudinally extending panel L-shaped in cross-section.

supporting elements 28. Each element 28 comprises a plurality of spaced idle rolls 29 pivotally mounted in side rails 30 which are preferably Projecting downwardly and securedto the horizontal flange of each rail ,are collars 3| which embrace the rods 21. a As shown in Figure 9, the rolls 29 are arranged to directly receive and support a stack of plywood sheets or panels. In order to accommodate panels of different sizes, the elements 28 are slidable on the cross rods 21 and may be adjusted toward or away from each other depending upon the size of the panels to be wrapped. Y j

The means for adjusting the elements 28 comprise a plurality of cross shafts 32 which are preferably mounted directly below the cross rods 21. Each shaft 32 is provided with right and left hand threads 33 and 34 respectively, and these are associated with nuts 35, each of which is welded or otherwise rigidly secured to a bracket 36 projecting downwardly from and secured to the outside collar 3| of .each element 28. Aligned openings are formed in each of the brackets 35 and these register with theopening in the nut 35 carried by the brackets. Each set of openings are arranged to receive the threaded portions of the shafts 32, so that upon rotation of the shafts, and by reason of the right and left hand threads, the opposite nuts and brackets 35 and 36 will be moved toward and away from each other, and thus carry with them'their respective elements 28. In order that the shafts 32 may be operated in unison, each shaft is provided with a sprocket wheel 31, and these are connected by a sprocket chain 38. Thus, by applying a suitable tool to any one of the squared end portions 39 of the cross shafts 32, the shafts are rotated and thus move the elements 28 toward or away from ing section without further rearrangement of the stack and carton sections, there is provided means for locating the panels upon the body portion 2| of the lower carton section and within the confines of the side and end flaps 22 and 23. This means comprises a side board 40 carried by and extending longitudinally of one of the elements 2,8. This board is directly connected to a plurality of side plates 4|, the lower portions of which are secured to the upright flange of the outer rail of one of the elements 28. Each plate 4! is provided with an inwardly opening side flap receiving slot 42, the lower wall of which is in substantially the same plane as the top surface of the rolls 29. Thus, when a carton section is initially placed upon the assembly table and is pushed against the side board 40, one side flap 22 will enter the slot 42, as clearly shown in Figure 9. The slots are of a length which will place the inner end of the flap 22 directly in line with the side boards whereby a stack of panels may be shoved against the side board and correctly positioned on the carton section 28.

In addition to employing the side board 45 and plates M, it is necessary that means be provided to correctly position one of the end flaps 23 of the carton section as it is placed on the assembly table. This means comprises an end plate 43 supported at its top by a cross bar 44 projecting from the side board 40. The end plate is secured at its base by a. block 45 carried by one of the side rails 30. Similarly to the side plates til, the end plate 43 is provided with an inwardly extending slot 46 located in the plane of the slots 42 and adapted to receive an end flap 23 of a carton section when the latter is initially positioned on the assembly table. Thus, by reason of the side board 40, the side and end plates M and 43 respectively, a carton section may be easily and quickly placed in position to correctly receive a stack of panels. That is, the stack will be positioned within the confines of all of the flaps, so that the subsequent flap folding and gluing operation may be executed without any rearrangement of the stack with respect to the carton sections. 3

Referring to Figure 10, it will be observed that the extreme forward end of the assembly table is connected to and supported by the package receiving end of the side flap gluing and folding seitionB. Preferably, the assembly table is of suflicient length to permit a stack of panels and carton sections to be assembled at one end while an assembled stack is supported at the other end in position to be received by the section B. In assembling the stack, an operator places a carton section on the table and against the side board and end plates as above described. This operator then, with the assistance of a second operator, places a stack of plywood sheets or panels on top of the carton section. One of the operators then moves the partially assembled stack forwardly on the table to a point clear of the side board 40 where another carton section is placed on the top of the stack so that all of the flaps are positioned exteriorly thereof. That is, the top carton section is positioned on top of the stack in the same relation as the lower carton section. In this manner, the assembled stack is moved over the rolls 29 to the end of the assembly table and introduced into the section B.

Side flap gluing and folding section The mechanism for folding and gluing the side flaps of the carton sections includes upper and lower positively driven belts 41 and 48 respectively (see Figures 10 to 19). These belts are adapted to receive each assembled stack from the assembly section A and feed it at the proper rate of speed while the side flaps of both carton sections are being folded and glued. All of this mechanism is mounted in an open frame struc ture preferably made up of rails of channel formation. These rails comprise uprights G9 which support and are connected to upper and lower longitudinal rails 50 and 5| respectively. Upper and lower cross rails 52 and 53 complete the main body of the open frame and adequately support the different units of the feeding, folding and gluing mechanism.

The lower belt 38 is of the endless type and is supported by and surrounds a plurality of idle rollers 54. These rollers are pivotally mounted between spaced longitudinally extending rails 55 supported centrally of the cross rails 53 by brackets 56 which are carried by the cross rails 53 and directly support the side rails 55 and rollers 54. One end of the endless belt 48 passes around a drive pulley 51 which is fixed upon a cross shaft 58 driven from any suitable source of power by means of the sprocket gearing 58'. The shaft 58 is journaled at its outer extremity in the longitudinal side rail 5|, while the inner end of the shaft is journaled in an upstanding bracket 59 connected to the cross rail 53 (see Figures 18).

The upper belt 41 is also of the endless type and, similarly to the the lower belt, is supported by and surrounds a plurality of idle rollers 60.

The rollers 54 are rigidly mounted in the rails 55 whereas the rollers 60 are mounted in the spaced channel bars 6| by means of hangers 62 which are normally spring-pressed downwardly into engagement with the lower run of the belt by the coil springs 63. The belt 41 passes around an end guide roller 64 mounted in'one end of the belt supporting unit 6| and is driven from a pulley 65 supported in, the bracket arms 66 (see Figure 17) carried by the ends of the bars 5|. The upper belt 41 derives its power from pulley shaft 58, and in order that the belt 4! may be adjusted relative to the belt 48 to accommodate packages of different heights or depths, a

flexible adjustable drive is provided between these two belts. The pulley 65 similarly to the pulley 51 is fixed to a cross shaft 6'! having one end journaled in the bracket arms 66, and its other end mounted in a bracket 68. A pair of box-like toggle elements 69 and 10 (see Figures 1'7 and 18) are. pivotally mounted on the ends of the shafts 61 and 58 respectively and house suitable sprocket gearing extending from these shafts. The inner ends of the toggles 69 and 10 are pivotally connected to a stub shaft passing through the toggles. With this arrangement, the power is taken from the shaft 58 through the sprocket gearing 12 which connects the shaft 58 with the stub shaft A second sprocket gearing'13 housed in the toggle 69 connects the stub shaft H with the upper cross shaft 61. Thus, the power imparted to the shaft 58 is transmitted through the sprocket chains 12 and 13 to the shaft 61, pulley 65, and the upper belt 41. Furthermore, by reason of the flexibility of the toggle elements, the upper belt 41 may be raised and lowered with respect to the lower belt without affecting the belt drive or necessitating disassembly of the same. At the same time, both belts are synchronously driven at the same speed.

The upper belt 41 and its supporting elements 6| are carried by a plurality of cross beams 14 which also support the bracket 68. These beams are mounted in pairs at opposite ends of unit B. As clearly shown in Figures 16, 17 and 18, each set of spaced beams 14 is connectedby cross braces 75 and is positioned below the cross rails 52. The extreme end portions of each set of beams embrace one of the upright rails 49 and a guide'pulley l6 is-journaled between each set of beams and is adapted to ride on the inner face of an upright 59. Thus, each upright 69 comprises a track upon which the end portions of each set of spaced beams is adapted to ride, with the rollers 16 facilitating the adjustment of the beams and preventing lateral movement of the same with respect to the uprights 49.

The mechanism for effecting adjustment of the beams 14 and of the upper belt ll comprises threaded shafts 11, one mounted in each corner of the framework. As shown in Figure 18, each shaft Tl passes through an opening in its respective brace 75 and also through a nut 78 welded or otherwise secured to the under face of the brace. The upper end of each shaft Tl passes through a second cross brace 19 connecting adjacent cross rails 52. A worm wheel 80 is fixed to the upper end of the shaft 11 above the brace 19 and meshes with a worm 8| fixed to a cross shaft 82. As shown in Figures 10 to 18, there is a shaft 82 at each end of the frame, and each shaft is journaled in the top side rails 50; Suitable sprocket gearing 83 connects the shaft 82 and each shaft is'provided with a squared extremity 86 for the reception of a suitable operating tool. and assuming that it is desired to either raise or lower the upper belt 81 to accommodate assembled stacks of different heights, it is necessary merely to rotate one of the shafts 82. This will impart rotation to all of the threaded shafts I1, and will raise and lower the cross beams 14 and the belt 81 supported thereby. This structure provides a very efficient means for adjusting the upper belt with respect to the lower without in any way disturbing the drive to the belts. Furthermore, a uniform synchronized drive of the belts is always provided and it is unnecessary to tear down or disassemble the driving connection between the belts when an adjustment is to be made.

Referring to Figures 10 and 11, it will'be observed that the feed belts 41 and 48 are centrally positioned in the'frame and are considerably smaller in width than the assembled stacks which are to be fed through the At each side nzliachine. of the frame structure, an extending longitudinally thereof are units 85, which support the sides of the stacks and operate upon the side flaps to effect the folding and gluing operations. Each longitudinally extending unit 85 comprises a pair of inwardly presented spaced channel members or rails 86 suitably secured together and sustaining a fiat flap supporting shelf 81. Each of the units 85 is supported at spaced intervals upon cross rods 88 which are mounted between the longitudinal rails 5|. The specific means of connection between the rails 86 and the rods 88 comprise collars 89 slidably mounted on the rods 88 and rigidly connected to the lower flanges of the rails 86. To the inner rail 86 of each unit is also secured an angle iron 90 adaptedto' support the adjacent longitudinal edge of an. assembled stack as it passes through the section. At the point where the stacks are received by the section B, a pair of vertically disposed guides 9| are mounted one on each unit 85. This is for the purpose of initially guiding each stack into the side flap folding and gluing section. v

A pair of flap folders 92 are mounted at the receiving end of the section B, and, as shown in Figures 10 and 11, are provided with horizon- Thus, with the present arrangement, 0

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